40102320021 has 4 divisors (see below), whose sum is σ = 53469760032. Its totient is φ = 26734880012.

The previous prime is 40102320007. The next prime is 40102320029. The reversal of 40102320021 is 12002320104.

40102320021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40102320021 - 2²³ = 40093931413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40102320029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6683720001 + ... + 6683720006.

It is an arithmetic number, because the mean of its divisors is an integer number (13367440008).

Almost surely, 2^40102320021 is an apocalyptic number.

It is an amenable number.

40102320021 is a deficient number, since it is larger than the sum of its proper divisors (13367440011).

40102320021 is a wasteful number, since it uses less digits than its factorization.

40102320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13367440010.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 40102320021 its reverse (12002320104), we get a palindrome (52104640125).

The spelling of 40102320021 in words is "forty billion, one hundred two million, three hundred twenty thousand, twenty-one".